When Mr. Cupples had been supplied with his monastic drink, and the waiter had retired, Trent looked across the table with significance. "In this babble of many conversations," he said, "we can speak as freely as if we were on a bare hill-side. The waiter is whispering soft nothings into the ear of the young woman at the pay-desk. We are alone. What do you think of that interview of this afternoon?" He began to dine with an appetite.

Without pausing in the task of cutting his mutton into very small pieces Mr. Cupples replied: "The most curious feature of it, in my judgment, was the irony of the situation. We both held the clue to that mad hatred of Manderson's which Marlowe found so mysterious. We knew of his jealous obsession; which knowledge we withheld, as was very proper, if only in consideration of Mabel's feelings. Marlowe will never know of what he was suspected by that person. Strange! Nearly all of us, I venture to think, move unconsciously among a network of opinions, often quite erroneous, which other people entertain about us. With regard to Marlowe's story, it appeared to me entirely straightforward, and not, in its essential features, especially remarkable, once we have admitted, as we surely must, that in the case of Manderson we have to deal with a more or less disordered mind. It was Mr. Bunner, I think you said, who told you of his rooted and apparently hereditary temper of suspicious jealousy. When the pressure of his business labors brought on mental derangement, that abnormality increased until it dominated him entirely."

Trent laughed loudly. "Not especially remarkable!" he said. "I confess that the affair struck me as a little unusual."

"Only in the development of the details," argued Mr. Cupples. "What is there abnormal in the essential facts? A madman conceives a crazy suspicion; he hatches a cunning plot against his fancied injurer; it involves his own destruction. Put thus, what is there that any man with the least knowledge of the ways of lunatics would call remarkable? Turn now to Marlowe's proceedings. He finds himself in a perilous position from which, though he is innocent, telling the truth will not save him. Is that an unheard-of situation? He escapes by means of a bold and ingenious piece of deception. That seems to me a thing that might happen every day and probably does so." He attacked his now unrecognizable mutton.

"I should like to know," said Trent after an alimentary pause in the conversation, "whether there is anything that ever happened on the face of the earth that you could not represent as quite ordinary and commonplace, by such a line of argument as that. You may say what you like, but the idea of impersonating Manderson in those circumstances was an extraordinarily ingenious idea."

"Ingenious—certainly!" replied Mr. Cupples. "Extraordinarily so—no! In those circumstances (your own words) it was really not strange that it should occur to a clever man. It lay almost on the surface of the situation. Marlowe was famous for his imitation of Manderson's voice; he had a talent for acting; he knew the ways of the establishment intimately. I grant you that the idea was brilliantly carried out; but everything favored it. As for the essential idea, I do not place it, as regards ingenuity, in the same class with, for example, the idea of utilizing the force of recoil in a discharged firearm to actuate the mechanism of ejecting and reloading. I do, however, admit, as I did at the outset, that in respect of details the case had unusual features. It developed a high degree of complexity."

"Did it really strike you in that way?" inquired Trent with desperate sarcasm.

"The affair became complicated," proceeded Mr. Cupples quite unmoved, "because after Marlowe's suspicions were awakened a second subtle mind came in to interfere with the plans of the first. That sort of duel often happens in business and politics, but less frequently, I imagine, in the world of crime. One disturbing reflection was left on my mind by what we learned to-day. If Marlowe had suspected nothing and walked into the trap, he would almost certainly have been hanged. Now how often may not a plan to throw the guilt of murder on an innocent person have been practised successfully? There are, I imagine, numbers of cases in which the accused, being found guilty on circumstantial evidence, have died protesting their innocence. I shall never approve again of a death-sentence imposed in a case decided upon such evidence."

"I never have done so, for my part," said Trent. "To hang in such cases seems to me flying in the face of the perfectly obvious and sound principle expressed in the saying that 'you never can tell.' I agree with the American jurist who lays it down that we should not hang a yellow dog for stealing jam on circumstantial evidence, not even if he has jam all over his nose. As for attempts being made by malevolent persons to fix crimes upon innocent men, of course it is constantly happening."

Mr. Cupples mused a few moments. "We know," he said, "from the things Mabel and Mr. Bunner told you what may be termed the spiritual truth underlying this matter: the insane depth of jealous hatred which Manderson concealed. We can understand that he was capable of such a scheme. But as a rule it is in the task of penetrating to the spiritual truth that the administration of justice breaks down. Sometimes that truth is deliberately concealed, as in Manderson's case. Sometimes, I think, it is concealed because simple people are actually unable to express it, and nobody else divines it."